I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
maniac manic manioc manioca manga muonic mango manque miaouing
maniac vinic snick scenic runic pianic manioc hypnic bionic ionic aeonic funkia hyphenic phonic tunica tonic hyenic xenic nick genic linac snack cynic pionic panic manic muonic quinic kaonic knack guanaco conic hygienic tunic tannic hyaenic sonic yonic
mania man amnia muni main mana mane manna mano many maun mawn mean meanie meany mini moan monie amain amnio